package org.example.utils;

import jakarta.annotation.Resource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    private  static final long BEGIN_TIMESTAMP=1640995200L;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    private static final int COUNT_BITS=32;

    public long nextId(String keyPrefix){
        //生成时间戳
        LocalDateTime now=LocalDateTime.now();
        long nowSecond =now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        // 生成序列号
        //获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        //自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        // 拼接并返回
        return timeStamp<<COUNT_BITS | count;
    }
    public static void main(String[] args){
        LocalDateTime time = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second="+second);

    }
}
